Greg plans to purchase a bicycle. bike a cost $270 and has an expected maintenance cost of $36 per year. bike b costs $360 and has an expected maintenance cost of $20 per year. which statement is true based on the average annual cost of each bike?

Solve the system of equations. y= 2x y= x^2 - 15

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?